I created a new button (check employees data) for hr_employee to check if we have multi employees who have the same name and same passport number and I created a new field employee_code.

I want when the user clicks this button the function will check for the employees who have the same names and passports numbers and fill employee_code for these employees with the same number.

Eg:

name| passport number| employee code

emp1       123                         10001

emp1       123                         10001

emp2      5555                       10002
emp1      0000                       10003